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You searched for: subject:"Voltage Stability"
[texts]An Algorithm for Determining the Load Margin of an Interconnected Power System - Dr Durlav Hazarika, Mr. Ranjay Das
The paper describes a new method for determining critical load for a bus with respect to its voltage collapse limit of an interconnected multi-bus power system. For this purpose, network partitioning technique is used to transform load flow Jocobian matrix into a two by two matrix with respect to a selected/target bus and a procedure has been developed to determine load margin of the target bus using the elements of the transformed two by two elements Jacobian matrix and the bus voltage of the t...
Keywords: Voltage Stability; Load Margin; Voltage Collapse; Power System
Downloads: 12
[texts]Identification of Reactive Power Reserve in Transmission Network
The paper describes importance of the reactive power control basing on the failures and control problems in the Polish transmission networks. A detailed description of the operational difficulties is provided. The paper also presents a highly automated method identifying voltage control areas (VCA), areas prone to voltage instability, and reactive power reserves requirement ensuring voltage stability under all considered contingencies...
Keywords: Power System Stability; Voltage Security Assessment; Voltage Stability; Intelligent Systems
Downloads: 58
[texts]Identification of Reactive Power Reserve in Transmission Network
The paper describes importance of the reactive power control basing on the failures and control problems in the Polish transmission networks. A detailed description of the operational difficulties is provided. The paper also presents a highly automated method identifying voltage control areas(VCA), areas prone to voltage instability, and reactive power reserves requirement ensuring voltage stability under all considered contingencies...
Keywords: Power System Stability; Voltage Security Assessment; Voltage Stability; Intelligent Systems
Downloads: 49
[texts]Online Voltage Instability Detection of Distribution Systems for Smart-Grid Applications
This paper presents a developed voltage stability index for identifying the most sensitive buses to the voltage collapse in radial distribution networks. The developed index is based on the transferred active and reactive power of a distribution line. The developed index utilizes the continuous power-flow solution calculated using real time power-flow software in distribution management systems. The developed stability index is tested and validated using commercial continuation load-flow program...
Keywords: Voltage Stability; Stability Index; Distribution Systems; Wind Energy; Smart-Grid
Downloads: 27
[texts]Determination of the Weakest Branch in a Radial Distribution System using Reactive Loading Index Range
This paper presents a unique and novel method to determine the weakest branch or heavily loaded branch of a radial distribution system by considering reactive loading index range. It is shown that the branch, at which the value of reactive loading index is  minimum, is considered to be the weakest branch or heavily loaded branch of the system. The effectiveness of the proposed method has been successfully tested in 12bus radial distribution system and the results are found to be in very good ag...
Keywords: Radial distribution system; reactive loading index; voltage collapse; voltage stability; weakest branch
Downloads: 268
[texts]Artificial Intelligence Technique based Reactive Power Planning Incorporating FACTS Controllers in Real Time Power Transmission System
Reactive Power Planning is a major concern in theoperation and control of power systems This paper comparesthe effectiveness of Evolutionary Programming (EP) andNew Improved Differential Evolution (NIMDE) to solveReactive Power Planning (RPP) problem incorporatingFACTS Controllers like Static VAR Compensator (SVC),Thyristor Controlled Series Capacitor (TCSC) and Unifiedpower flow controller (UPFC) considering voltage stability.With help of Fast Voltage Stability Index (FVSI), the criticallines a...
Keywords: FACTS Devices; SVC; TCSC; UPFC; Reactive power planning; Fast Voltage Stability Index; Evolutionary programming; Differential Evolution
Downloads: 21
[texts]1. Electrical IJEEE PERFORMANCE IMPROVEMENT OF TRANSMISSION Ramprasad
Power losses and voltage instability are major problems in present power systems. It has become more complex day by day due to less security and reliability. Flexible AC transmission systems (FACTS) controllers have been mainly used for solving various power system steady state control problems. Flexible AC transmission systems or FACTS are devices which allow the flexible and dynamic control of power systems and enhancement of system stability using FACTS controllers...
Keywords: Voltage Stability; Flexible AC Transmission Systems (FACTS); Unified Power Flow Controller (UPFC); Genetic Algorithm (GA); Particle Swarm Optimization (PSO)
Downloads: 1
[texts]Hybrid Particle Swarm Optimization for Multi-objective Reactive Power Optimization with Voltage Stability Enhancement
This paper presents a new hybrid particle swarm optimization (HPSO) method for solving multi-objective real power optimization problem. The objectives of the optimization problem are to minimize the losses and to maximize the voltage stability margin. The proposed method expands the original GA and PSO to tackle the mixed –integer non- linear optimization problem and achieves the voltage stability enhancement with continuous and discrete control variables such as generator terminal voltages, t...
Keywords: Hybrid Particle Swarm Optimization (HPSO); real power loss; reactive power dispatch (RPD); Voltage stability constrained reactive power dispatch (VSCRPD)
Downloads: 207
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